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  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Rear
  5. 1-1/2 Inch Diameter
  6. Steel w Polyurethane Bushing
Roadmaster Rear Anti-Sway Bar

Roadmaster Rear Anti-Sway Bar

Item # RM-1209-131
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Anti-Sway Bars

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Anti-Sway Bars RM-1209-131 - Rear - Roadmaster
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Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll. 1-800-940-8924 to order Roadmaster anti-sway bars part number RM-1209-131 or order online at Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Rear Anti-Sway Bar. Anti-Sway Bars reviews from real customers.
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Roadmaster Anti-Sway Bars - RM-1209-131

  • Anti-Sway Bar
  • Rear
  • Roadmaster
  • 1-1/2 Inch Diameter
  • Steel w Polyurethane Bushing

Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll.


  • Minimizes side-to-side movement to improve overall stability of your vehicle
    • Lets you execute turns and quick maneuvers with confidence
    • Allows for a level ride, even on irregular surfaces
    • Reduces driver fatigue - minimizes effort required to keep your vehicle in line
  • Diminishes effects of crosswinds, passing motorists and shifting cargo
  • Designed to fit your vehicle and work in conjunction with its suspension system
    • Attaches to rear axle and to chassis - uses weight of axle to brace frame as it shifts in turns
    • Engineered to avoid interference with most popular aftermarket add-ons and accessories
  • Made with polyurethane bushings instead of the standard rubber variety for a longer-lasting system
    • Polyurethane is durable and resistant to damage caused by oil, gasoline and ozone
    • Less wear means less give in the system and better support
  • Constructed of thick 4140 chromoly steel for superior strength
  • Includes heavy-gauge mounting hardware, easy-to-follow instructions and bushing lubricant
  • Made in the USA


  • Bar diameter: 1-1/2"
  • Limited lifetime warranty

Roadmaster Anti-Sway Bar Installed

Benefits of an Anti-Sway System

The Roadmaster anti-sway bar does for side-to-side movement what a good pair of shocks does for up-and-down motion. You will notice a marked improvement in your vehicle's stability as the bar works to balance weight transfer and reduce body roll. The anti-sway bar acts as a link between your vehicle's frame and its rear axle, using the axle as a brace to more effectively balance the shifting weight of your vehicle as you maneuver it. Lubricated bushings allow just enough pivot and rotation to compensate for the pressure placed on one side of your vehicle when it goes into sudden maneuvers, hits crosswinds or encounters shifting weights.

Roadmaster Anti-Sway Polyurethane Bushings

Superior Construction

The Roadmaster anti-sway bar is made of 4140 chromoly, a chromium and molybdenum steel alloy. This type of steel is considerably harder and stronger than the standard 1020 steel that is typically used in anti-sway applications. In addition, the larger diameter of the bar increases its torsional roll stiffness. The result is a bar that is not only stronger than the competition, but also nearly 30 percent better at resisting sway. The polyurethane bushings and grommets used at the attachment points are durable yet flexible, ensuring that the system is neither so rigid nor so malleable that it becomes ineffective.

1209-131 Road Master Anti-Sway Bar - Rear

Installation Details RM-1209-131 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster Rear Anti-Sway Bar - RM-1209-131

Average Customer Rating:  4.8 out of 5 stars   (1065 Customer Reviews)

Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll.

2015 Mercedes-Benz Sprinter

The package arrived in a timely manner, just as promised. The installation went as described in the instructions and everything fit well. It improved the handling quite a bit. I already had installed “Sumo Springs” last year (worked great) and the sway bar controlles the sway even more. One thing I can add is, get a long 1/2” drill bit (8” long) to help with drilling the front bracket holes. The drill chuck on my drill, hit the link tabs, causing me to drill at a slight angle (horizontal holes).
The biggest problem I encountered is that the bar contacts the exhaust pipe (1/4” gap) and makes noise when driving (see photos) . I have a diesel and the exhaust pipe is about 3” in diameter, which doesn’t help. I’m trying to figure out how to resolve this issue. I will update when I do.

When the anti-sway bar is installed, it is in a set position, but because the exhaust uses rubber isolators that suspend it from the exhaust hangers, the actual position of the exhaust pipe can vary a bit. The good news is that the positioning of the exhaust can be modified a little bit by gently bending the exhaust hangers. If that doesnt work, you can go to a muffler shop and have the exhaust hangers relocated fairly inexpensively.
-- Etrailer Expert Mike L - 05/15/2018
It should be a factory option. It controls the sway like I hoped it would. No issues one year later.
William - 05/16/2019


Installed 4/25/2022 seems to have improved ride will be taking trip next month real test easy to install if have tools to do so ,did have to remove exhaust to install cut pipe off ,this 2016 navion class c had exhaust running out to rear easy to remove ,shop reinstalled today 4/26/2022 good as new this kit was newer frame brackets have changed multiple holes to fasten end links to so only one size end links if you have 2 inch block under factory springs the bottom hole is the one to use you will need to install end link before mounting permit to frame bolt will hit springs if you do not you will have to remove to do so side two went much quicker drill bit is 17/32 you will need one for steel was able to use impact drill with good quality bit 4.5 hours to install myself at 67 years old you can do this E-Trailer folks are good to help also happy travels


The Roadmaster anti sway bar and bushings along with the sumo products also from you folks took care of problems on our class C motorhome.

I very pleased with my sway bar and sumo springs, they have kept my top heavy trailer on the pavement. Wind shear is far less than before I install said items.
David - 02/15/2022

Winnebago Navion

The Road master sway bar made a remarkable difference in the handling of my 25.5' Winnebago Navion. High winds and passing trucks made handling difficult, and forced me to slow down before this mod. Now I can drive 70 to 80 mph in most conditions and in comfort. Just an amazing difference. I also like that installation does not require removal of the oem sway bar, so I now have double stability.


One of the best upgrades to my Winnebago Navion. It did require modifying the exhaust slightly, but I brought it to a truck shop near me who put it on and adjusted for maybe $200 or so. A little pricey but makes a huge difference when youre the highway in the wind or getting past by a truck. No downsides other than the cost, but well worth it for how we use our RV.

2018 Ram 3500

RM-1209-131 delivered a day earlier than promised. Installed on 2018 Winnebago 24V View on 2016 Mercedes 3500 sprinter chassis. Good fit had to modify the exhaust which exits on shotgun side ahead of wheels which was to close to the long links. Drove 20 miles to my indoor storage. Quite a reduction to side to side sway. Handles like a different vehicle (better). Can’t WAITE till our next trip. Tulsa auto spring did the installation. Mikes custom muffler shop did the exhaust modification. Do believe l made the right decision not to tackle the job on my own $250 to install. $120 for exhaust modification. In Tulsa, Ok wouldn’t, go anywhere else to get the job done.

Driven 7500 miles wind trucks and mountains out west. Went from scary ride to more like my f150. Can’t believe Winnebago doesn’t do this at the factory prior to delivery. It would improve their sales probably so much that the cost would be absorbed.
Gary M - 10/11/2020


Sold my RV about a month after installing but it was a big improvement to my class c view

2018 Mercedes-Benz Sprinter 3500

I just received the sway bar today and was delivered very expeditiously. I do want to thank the etrailer staff for providing great service. I want to especially thank Conner L for working with me patiently to expertly advise me what I need to correct a sway issue I'm have with my RV coach. Conner is very well versed in RV technical knowledge and was a great help in suggesting options. My entire experience was very fluid through out the whole process. The assembly arrived quicker than anticipated and the shipping web site kept me informed as to where the shipment was each day. I'm looking forward to the benefits of my sway bar assemble as soon as it is installed. I am also looking forward to my next etrailer purchase. Thank you again.

Tony K - 07/23/2019

2012 Dodge Sprinter

I just installed the roadmasteranti sway bar 1209-131 on my 2013 Winnebago via.The vehicle is a 2012. it fit well and road test good. I had to shorten the exhaust about 9 inches because it interfered with drivers side arm other than that its good to go.

I am thinking about adding the 1209-131 to my 2011 Winnebago Via 25Q. Which model Via do you have? Im hoping I wont have to modify the exhaust on my Via Q. Thanks.
-- comment by: Jim - 02/17/2014
I put the sway bar on a 2012 25t I did shorten the exhaust about 9 inches I think 2 or 3 inches would have been good. That was easy to do, as new as they are just take exhaust loose at first coupling pass the elbow slide it out and take some off the piece that goes to the inside. Worked well for me. Going from our drive onto the blacktop road in front of our place was all it tuck to decide it was worth the effort. It fit very well. Thanks Mack. PS I am 75 and 240 Made a man door step for drivers door .It works well Love it. Mack
-- comment by: Mack - 02/19/2014

Thanks for following up with us!

-- Etrailer Expert Patrick B - 2/19/2014

Mack, Patrick,Thank you!
-- comment by: Jim - 02/20/2014
Still working very good I am not sure I needed to shorten exhaust but I did not know how much movement would be in the down rod So I did it just in case, working very good Mack
Mack - 11/21/2014


Installed the Roadmaster sway bar (RM-1209-131) and SumoSuper Springs (SSF-106-47 and SSR-338-54) on our 2020 Thor Tiburon. It made a huge difference. Before installing these items driving the rig was pretty scary at anything over 55 mph, even on smooth roads and limited wind. The rig would start to rock after a semi passed or slight dip in the lane and it would take what seemed like for ever for her settle down. Now driving the rig is a much more in-control feeling. It's noticeable for the passengers as well. Totally recommend this for anybody with a MBZ 3500 chassis. It didn't make the ride any harsher, just more in control. Installation wasn't too difficult. Be sure to watch the different install videos, some good pointers in those to make the installation easier.


Motorhome handles so much better now, no sway when passed by semi's and no play in steering wheel with this and front anti-sway bar

2015 Mercedes-Benz Sprinter

I put this on my 2015 Winnebago view. I left the stock swaybar and added this one to the front of the rear axle. It was the single biggest improvement that I did to the suspension. I can't believe Winnebago sells the RV without this upgrade. It improves handling in the wind or turning corners tremendously.


It took a little effort on the phone to figure out which sway bar was needed for the motorhome I have. I was skeptical about the right one being sent but it was correct and installation was a couple of hours. It fit perfectly and really dampened the body roll we were having. Worked great, service and delivery was fantastic. This was the first time I have used and am very happy with their product and willingness to help. I'll be using them again and I highly recommend them.


My communication with etrailer was fantastic, as usual. Pat is great, knowledgeable and easy to get correct information from, and to her. I suggest anyone not being sure of what their needs are to call and talk to Pat. Shipping is fast, and I got emails every step of the process. I like that. I've purchased several items from etrailer, always top quality products.


Sold the vehicle it was installed on. Replaced the RV with a new on and have now installed the sway bar on it. Nice improvement to the stability.


This thing changed the handling of my RV significantly. It was like going from a horse and buggy to a sports car! It truly made a huge difference in the wind, rough roads, crossing parking lot aprons and cornering. It's worth the money to make the upgrade and Etrailer did an excellent job on the install!


Very good! Heavy duty, and easy to inst all.

Ram 3500

Installed on MB Sprinter 3500 RV. Corrected sway and yaw when being passed by big rigs. Install directions were confusing. Called Roadmaster, they sent better instructions and talked with installer and solved the issue.


14 Winnebago View
Added Suma Springs
and Koni FSD Shocks the same time I installed the sway bar, so not sure exactly how much each component contributed, but it was the best handling ever. A lot less sway and barely noticed semi trucks passing, in either direction. Also, the cruise control never shut off, and I did have some strong crosswinds.


Easy to follow instructions and easy installation. Installed myself without a lift. Video very helpful.


Good Product, great customer service from etrailer. They stocked the product and shipped it prompt.


This anti sway bar did the trick! Excellent seller & excellent product.


This product definitely improved the RV's handling in 2 situations: being passed by anything larger than a motorcycle; and making slow turns in/out of driveways or moving over speed humps. Recommend.


It made my RV drive like a dream


It reduced the sway on my class c rv by 75%. Enough to make it way more safe and relaxing to drive.

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